M.I. Nathan, M. Heiblum
IEEE Spectrum
Paper
Energy band discontinuities in heterojunctions measured by internal photoemission
Abstract
A novel method involving internal photoemission has been developed to determine the conduction band discontinuity Δ Ec of heterojunctions. The method is straightforward, accurate, and assumes minimum unknowns; and has been applied to GaAs/AlxGa1-xAs heterojunctions. We have found for x<0.4 that Δ Ec≅0.62 Δ Eg, where Δ Eg is the band-gap difference. For x>0.4, the apparent Δ Ec is considerably smaller.
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